hello!
i dont really understand what you mean with:
"At 50%, they are only half their size. That's why I changed it to 100%"
If you use the splitscreen type of layout, the left half needs to be 50% and the right 50%
or 20% and 80%
they always need to be 100% width combined.
if you have two sides that are both 100% width, it doesn't make sense :D